9  * The IPA has an interrupt line distinct from the interrupt used by the GSI
13  * embedded in the IPA.  Each IPA interrupt type can be both masked and
22 #include <linux/interrupt.h>
36  * struct ipa_interrupt - IPA interrupt information
40  * @suspend_enabled:	Bitmap of endpoints with the SUSPEND interrupt enabled
49 /* Clear the suspend interrupt for all endpoints that signaled it */
50 static void ipa_interrupt_suspend_clear_all(struct ipa_interrupt *interrupt)  in ipa_interrupt_suspend_clear_all()  argument
52 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_clear_all()
64 		/* SUSPEND interrupt status isn't cleared on IPA version 3.0 */  in ipa_interrupt_suspend_clear_all()
73 /* Process a particular interrupt type that has been received */
74 static void ipa_interrupt_process(struct ipa_interrupt *interrupt, u32 irq_id)  in ipa_interrupt_process()  argument
76 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_process()
87 		/* For microcontroller interrupts, clear the interrupt right  in ipa_interrupt_process()
95 		/* Clearing the SUSPEND_TX interrupt also clears the  in ipa_interrupt_process()
97 		 * caused the interrupt, so defer clearing until after  in ipa_interrupt_process()
100 		ipa_interrupt_suspend_clear_all(interrupt);  in ipa_interrupt_process()
112 	struct ipa_interrupt *interrupt = dev_id;  in ipa_isr_thread()  local
113 	struct ipa *ipa = interrupt->ipa;  in ipa_isr_thread()
114 	u32 enabled = interrupt->enabled;  in ipa_isr_thread()
127 	 * including conditions whose interrupt is not enabled.  Handle  in ipa_isr_thread()
139 			ipa_interrupt_process(interrupt, irq_id);  in ipa_isr_thread()
162 	iowrite32(ipa->interrupt->enabled, ipa->reg_virt + reg_offset(reg));  in ipa_interrupt_enabled_update()
165 /* Enable an IPA interrupt type */
168 	/* Update the IPA interrupt mask to enable it */  in ipa_interrupt_enable()
169 	ipa->interrupt->enabled |= BIT(ipa_irq);  in ipa_interrupt_enable()
173 /* Disable an IPA interrupt type */
176 	/* Update the IPA interrupt mask to disable it */  in ipa_interrupt_disable()
177 	ipa->interrupt->enabled &= ~BIT(ipa_irq);  in ipa_interrupt_disable()
183 	disable_irq(ipa->interrupt->irq);  in ipa_interrupt_irq_disable()
188 	enable_irq(ipa->interrupt->irq);  in ipa_interrupt_irq_enable()
192 static void ipa_interrupt_suspend_control(struct ipa_interrupt *interrupt,  in ipa_interrupt_suspend_control()  argument
195 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_control()
205 	/* IPA version 3.0 does not support TX_SUSPEND interrupt control */  in ipa_interrupt_suspend_control()
209 	weight = bitmap_weight(interrupt->suspend_enabled, ipa->endpoint_count);  in ipa_interrupt_suspend_control()
221 	__change_bit(endpoint_id, interrupt->suspend_enabled);  in ipa_interrupt_suspend_control()
231 ipa_interrupt_suspend_enable(struct ipa_interrupt *interrupt, u32 endpoint_id)  in ipa_interrupt_suspend_enable()  argument
233 	ipa_interrupt_suspend_control(interrupt, endpoint_id, true);  in ipa_interrupt_suspend_enable()
238 ipa_interrupt_suspend_disable(struct ipa_interrupt *interrupt, u32 endpoint_id)  in ipa_interrupt_suspend_disable()  argument
240 	ipa_interrupt_suspend_control(interrupt, endpoint_id, false);  in ipa_interrupt_suspend_disable()
243 /* Simulate arrival of an IPA TX_SUSPEND interrupt */
244 void ipa_interrupt_simulate_suspend(struct ipa_interrupt *interrupt)  in ipa_interrupt_simulate_suspend()  argument
246 	ipa_interrupt_process(interrupt, IPA_IRQ_TX_SUSPEND);  in ipa_interrupt_simulate_suspend()
249 /* Configure the IPA interrupt framework */
252 	struct ipa_interrupt *interrupt = ipa->interrupt;  in ipa_interrupt_config()  local
253 	unsigned int irq = interrupt->irq;  in ipa_interrupt_config()
258 	interrupt->ipa = ipa;  in ipa_interrupt_config()
260 	/* Initially all IPA interrupt types are disabled */  in ipa_interrupt_config()
261 	interrupt->enabled = 0;  in ipa_interrupt_config()
262 	interrupt->suspend_enabled = bitmap_zalloc(ipa->endpoint_count,  in ipa_interrupt_config()
264 	if (!interrupt->suspend_enabled) {  in ipa_interrupt_config()
269 	/* Disable IPA interrupt types */  in ipa_interrupt_config()
274 				   "ipa", interrupt);  in ipa_interrupt_config()
293 	ipa->interrupt = interrupt;  in ipa_interrupt_config()
300 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_config()
302 	bitmap_free(interrupt->suspend_enabled);  in ipa_interrupt_config()
304 	kfree(interrupt);  in ipa_interrupt_config()
312 	struct ipa_interrupt *interrupt = ipa->interrupt;  in ipa_interrupt_deconfig()  local
315 	ipa->interrupt = NULL;  in ipa_interrupt_deconfig()
319 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_deconfig()
320 	bitmap_free(interrupt->suspend_enabled);  in ipa_interrupt_deconfig()
323 /* Initialize the IPA interrupt structure */
326 	struct ipa_interrupt *interrupt;  in ipa_interrupt_init()  local
333 	interrupt = kzalloc(sizeof(*interrupt), GFP_KERNEL);  in ipa_interrupt_init()
334 	if (!interrupt)  in ipa_interrupt_init()
336 	interrupt->irq = irq;  in ipa_interrupt_init()
338 	return interrupt;  in ipa_interrupt_init()
342 void ipa_interrupt_exit(struct ipa_interrupt *interrupt)  in ipa_interrupt_exit()  argument
344 	kfree(interrupt);  in ipa_interrupt_exit()